CCNP Interview Questions

1.In a router, what is default route used for?

It is used when there is no specific entry in the routing IP table.

2.What will the BGP first check to see if a prefix is accessible?
BGP will check next hop attribute to determine next hop is accessible

3.What are the two methods for reducing the number of IBGP connection in a network?
These are confederation and route reflector

4.In a network of routers and switches, what is the difference between routing and switching?
Switching make the final ultimate delivery while routing select the best available path in a network.

5.What is the difference between RIP and OSPF?
RIP broadcast its routing table after each 30 seconds while OSPF only update those entries which are missing the neighbor routing table

6.What is the difference between Classless and Classfull routing?
Classfull routing don not advertise subnet mask information along with the network prefix while classless routing do.

7.What is the main purpose of areas in OSPFv2?
Routers networks are divided in to areas which are they connected to backbone area0. The areas help you to give performance and easy to handle big network

8.What types of routers are allowed in totally stubby areas?
In totally stubby area, inter area and intra area route and default route are allowed.

9.What are the router types in OSPF?
There are Internal Router, ASBR and ABR

10.What will be the broadcast IP of the 202.4.81.96/27?
202.4.81.127

11.In OSPFv2, what is the purpose virtual link?
The main purpose of virtual link is to connect nonzero area with backbone area.

12.What will be the administrative distance of OSPF routes?
110

13.The administrative distance of RIP is 170, is that right?
No

14.What is level one routing in IS-IS?
It is routing between destinations in the same IS-IS area.

15.Which multicast does OSPF used for sharing routing information?
OSPF use 224.0.0.6 for sharing routing information

16.What is the purpose of WEIGHT attribute on OSPF?
There is no attribute such as WEIGHT in OSPF

17.In BGP, what is the purpose of AS_PATH attribute?
If a route has more than one route to the same IP prefix, the best path is the one with the shortest AS_PATH

18.What is synchronization?
It is said to be the property of IBGP.

19.How many flavor of BGP are?
There are two flavors of BGP, EGP and IGP

20.Which TCP port does BGP used to establish connection between routers?
BGP use 179 port o TCP.

21.What will be the wildcard address for 176.9.120.142/24?
0.0.0.225

22.What will be the net mask for the 176.9.59.4/16?
255.255.0.0

23.What will be the administrative distance of directly connected two interfaces with router?
It will be zero

24.What is the administrative distance of EGP?
The administrative distance for EGP is 140.

25.What will be the administrative distance of static route to the next hop?
The static route distance will be 1 even with the next hop.

26.Why would you use areas in BGP protocols?
There is no area concept in BGP protocol.

27.What is redistribution?
It is a concept by which two different routing protocol can communicate and exchange information with each other

28.Does RIPv1 support Classless routing?
RIPv1 does not support classless routing. RIPv2 support classfull and classless routing both.

29.How can you get a continuous with this ip on router 176.9.41.131?
Just add –t at the end of the IP… like 176.9.41.131 –t

30.What is the total range of multicast addresses in IPv4?
224-239

31.What is the difference between STP and RSTP?
STP is used to prevent switching loop in the switching network, while RSTP is almost same as STP just only one thing which is timing of port forwarding has been reduce to 0.

32.What is access layer in switching network?
The access layer is said to be the layer in which host are connected with the  switch it is a end layer connected host with the switch. Layer 2 switches are mostly used in access layer.

33.What is a core network?
A core network is where the entire main network lives. Without core network, the whole network cannot be run. All routers and switches are connected to their core network.

34.When you are configuring virtual link, which router will be configured?
The configuration is between ABRs router

35.What is private vlan used for?
Private vlan is a concept in vlan you can have vlans in a single vlan. It is used in where hundreds of vlans are configured. You only need to make one vlan and all other vlans in this vlan.

36.Sw_A revision number 22. You have made 2 vlans one by one and 3 vlans in one command, what will be the final revision number?
25

37.At which layer of OSI does TCP work?
It works at transport layer

38.At which layer of OSI does TCP/IP work?
TCP/IP is two protocols. IP work at layer 3 and TCP at layer 4

39.What is route summarization?
It is a method in which you can summarize route in one IP/network

40.Is RIP v2 is link state protocol?
No, it is distance vector protocol

41.At which layer SIP protocol work?
SIP work at Application layer of OSI.

42.Which protocol does RIP use to transport data?
RIP use UDP

43.At which layer of internet protocol suite, ICMP work?
It works at internet layer

44.Home many types of RIP messages?
There are two type of RIP messages, these are request and respond.

45.At which layer HUB work?
Hub works at physical layer.

46.What is the purpose or HTTP protocol?
It is used to transfer data or files over internet.

47.What does DNS do in a network?
DNS is domain name server. It is used to translate IP into domain name and vice versa

48.What QoS parameters are required to transfers credential file from one source to a destination?
The main QoS parameters required is Bandwidth and Data loss.

49.What is voice circuit?
It is specially used for voip only because it have ports enable on it which allow voip traffic.

50.What is a load balancer?
It is a network device which is used to balance the load in on available nodes